What is fractional share?Fractional Share

A portion of a share smaller than 1, such as 0.25 shares. Many US brokers let you buy by dollar amount (for example $10 for part of a share); it's a broker feature, not an exchange rule.

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US Stock Rules
Buy from 1 Share, and Fractional Shares
US stocks have no lot requirement, so you can buy just 1 share; many brokers also let you buy fractional shares by dollar amount, so a few dollars can own a slice of an expensive stock.

Related terms

board lot
round lot

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